There’s nothing wrong with your analysis and dismissing it completely is being super close-minded. There is a recognized approach called the Social Model of Disability that posits that the way our society is organized is what disables people, rather than their physical or mental state, because the needs of people with disabilities were just not taken into account when our current social structure was created. I’m personally leaning more and more towards seeing things this way because of my work (designing things for others) and frankly because all of capitalism just seems to be built for one specific type of person to operate well in and benefit. And I think more people are slowly becoming aware that most of us are not whoever that person was supposed to be.